The data-sharing agreement between DeepMind and the Royal Free NHS Trust reportedly gives DeepMind access to a "wide range" of healthcare data on the 1.6 million patients who use Barnet, Chase Farm, and the Royal Free hospitals in London annually.

DeepMind will reportedly be able to see, for example, whether patients are HIV-positive, or whether they have overdosed on drugs, or had an abortion. Hospitals will also share the results of certain pathology and radiology tests, according to New Scientist.

The data can't be used to identify individual patients. "No patient-identifiable data is shared with DeepMind," a spokeswoman for the Royal Free NHS Trust told CNET. "The information is encrypted and only the Royal Free London has the key to that encryption."

Google declined to comment.

Using AI in healthcare could significantly improve the way and speed at which people are diagnosed and treated, according to the team at DeepMind.

DeepMind announced its partnership with the NHS back in February, saying it had created an app called Streams that could help hospital staff to monitor patients with kidney disease, or acute kidney injury (AKI), as it is otherwise known. However, the data-sharing agreement implies that DeepMind could also be looking at other illnesses.

Sam Smith, who runs health data group MedConfidential, told New Scientist that this is the first we've heard about DeepMind getting access to historical medical records. "This is not just about kidney function," he said. "They're getting the full data."

The agreement is said to note that Google cannot use the data in any other parts of its business. The data itself will reportedly be stored in the UK by a third-party contractor, not at DeepMind's office in King's Cross, London. DeepMind will have to delete the data when the agreement expires at the end of September 2017, according to New Scientist.

Google reportedly said that there are no separate datasets for people with kidney conditions, meaning DeepMind needs to access all of the data in order for its Streams app to work.

DeepMind receives the NHS data under strict information governance rules, just like the other 1,500 recorded third-party organisations who have certification to process patient data at present.

Nathan Benaich, an investor at venture capital firm Playfair Capital, told Business Insider: "I don't think the risk profile of DeepMind Health should be any different from the likes IBM or GE Healthcare that have been in the business for longer."

DeepMind insists that patient data will be kept completely separate from Google accounts, products, and services. But New Scientist states that some people are still likely to be concerned, highlighting that Google is being given logs of day-to-day hospital activity, including records of the location and status of patients, in addition to who visits them and when.

The data that DeepMind is collecting will allow it to make predictions about any disease it wants, according to Smith. "What DeepMind is trying to do is build a generic algorithm that can do this for anything - anything you can do a test for," he said.

Ross Anderson, an academic at the University of Cambridge, questioned whether Google should have so much control over health analytics. " If Google gets a monopoly on providing some kind of service to the NHS it will burn the NHS," he told New Scientist.

Google doesn't currently have any plans to commercialise DeepMind's work with Royal Free, according to New Scientist.

A panel comprised of government tech leaders and healthcare experts is set to scrutinise the work of Google DeepMind's healthcare team at an upcoming meeting, which could be held within the next month.